Saturday, December 30, 2017

thermodynamics - Radiation– white vs black house, hot or cool?


In my book's thermodynamics chapter, it says that an




"object that radiates heat faster also absorbs heat faster. This means that an object that is a more efficient radiator comes to equilibrium with its environment more quickly. With this in mind, is it better to paint your house black or white?"



I am confused which it would be. The book says white because



"in summer, you house is cooler than the environment and white reflects away the heat. In winter your house is warmer than the environment and white radiates away the heat"





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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...